Add wiring for maintaining a dashboard

Makefile

@@ -81,3 +81,10 @@ kill-csv-iexport:
 	@kill -9 `pgrep csv_iexport.sh`
 
 # ---------------------------- CSV Export ----------------------------
+
+
+dash-export:
+	@./dashboards/export.sh
+
+dash-import:
+	@./dashboards/update.sh

dashboards/export.jq

@@ -0,0 +1,28 @@
+.dashboard | . as $dash
+
+| [paths(type == "object"
+    and (.datasource?.uid? | type) == "string"
+    and .datasource.type? == "prometheus")] as $uids
+
+| reduce $uids[] as $path ([]; ($dash | getpath($path).datasource.uid) as $uid | if [.[] == $uid] | any then . else . + [$uid] end)
+| . as $unique_uids
+
+| [range($unique_uids | length) | {key: $unique_uids[.], value: "DS\(.+1)"}]
+| from_entries as $uid_map
+
+| reduce $uids[] as $path ($dash; setpath($path + ["datasource", "uid"]; "${\($uid_map[getpath($path).datasource.uid])}"))
+
+| reduce paths(type == "object" and has("current") and has("datasource"))
+    as $path (.; setpath($path + ["current"]; {}))
+
+| .id = null
+| .__inputs = [$unique_uids[] | {
+    name: $uid_map[.],
+    label: "Prometheus",
+    description: "",
+    type: "datasource",
+    pluginId: "prometheus",
+    pluginName: "Prometheus",
+}]
+| .__requires = []
+| .__elements = {}

dashboards/export.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -e
+
+cd "$(dirname "$0")"
+
+. ../.env
+
+: ${DASHBOARD_NAME:=indexer}
+: ${DASHBOARD_UID:="$(jq -r .uid "${DASHBOARD_NAME}.json")"}
+
+
+curl -s --fail-with-body "${GRAFANA_URL}/api/dashboards/uid/${DASHBOARD_UID}" | jq --sort-keys -f export.jq > "${DASHBOARD_NAME}.json"

dashboards/update.jq

@@ -0,0 +1,18 @@
+$current[0].dashboard as $cur
+| ([$cur | .. | select(.datasource?.type? == "prometheus")] | first | .datasource.uid) as $datasource
+
+| .templating.list = [
+  .templating.list[] | .name as $name
+  | .current = ($cur.templating.list[] | select(.name == $name) | .current) // {}
+]
+
+| . as $dash
+
+| [paths(type == "object"
+    and .datasource.type? == "prometheus")] as $uids
+
+| reduce $uids[] as $path ($dash; setpath($path + ["datasource", "uid"]; $datasource))
+
+| .id = $cur.id
+| .version = $cur.version
+| {dashboard: ., overwrite: false}

dashboards/update.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+set -e
+
+cd "$(dirname "$0")"
+
+. ../.env
+
+: ${DASHBOARD_NAME:=indexer}
+: ${DASHBOARD_UID:="$(jq -r .uid "${DASHBOARD_NAME}.json")"}
+
+if ! curl -X HEAD -s --fail-with-body "${GRAFANA_URL}/api/dashboards/uid/${DASHBOARD_UID}"; then
+  echo "Dashboard with UID ${DASHBOARD_UID} is not found. Please import $(dirname "$0")/${DASHBOARD_NAME}.json once, and later use this command again to update it." >&2
+  exit 1
+fi
+
+CUR_DASHBOARD="$(mktemp -t "${DASHBOARD_NAME}.json.XXXXXXX")"
+curl -s --fail-with-body "${GRAFANA_URL}/api/dashboards/uid/${DASHBOARD_UID}" > "${CUR_DASHBOARD}"
+
+jq --slurpfile current "${CUR_DASHBOARD}" \
+  -f update.jq "${DASHBOARD_NAME}.json" \
+  | curl --json @- -s --fail-with-body "${GRAFANA_URL}/api/dashboards/db"
+
+rm "${CUR_DASHBOARD}"

example.env

@@ -1,4 +1,9 @@
 POSTGRES_PASSWORD='some password'
 DATA_DIR=
 CSV_DIR=
-METRICS_ADDR=
+
+# IP address to expose HTTP ports on
+METRICS_ADDR=0.0.0.0
+
+# Grafana URL with username and password. Only needed if you're going to import the dashboard.
+#GRAFANA_URL="https://<username>:<password>@<hostname>"